code: def exists(path, aws_credentials={}):
      if is_local_path(path):
          return os.path.exists(path)
      else:
          raise ValueError("Unsupported protocol %s" % path)
  
file_path: turicreate/src/python/turicreate/util/_file_util.py
imports: from __future__ import print_function
  from __future__ import division
  from __future__ import absolute_import
  import os
  import logging
  import shutil
label_desc: Use image node_id 3 for calling a global function with example usage: exists(path, aws_credentials) and returns: os